The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 2015
Filed:
May. 07, 2012
Richard Thomas Kavanaugh, Encinitas, CA (US);
Gustav Gerald Vos, Surrey, CA;
Vasilios V. Daskalopoulos, Edison, NJ (US);
Richard Thomas Kavanaugh, Encinitas, CA (US);
Gustav Gerald Vos, Surrey, CA;
Vasilios V. Daskalopoulos, Edison, NJ (US);
Sierra Wireless, Inc., British Columbia, CA;
Abstract
A method and apparatus for maintaining a communication link through a NAT or other boundary device. Keep-alive messages (keep-alives) are transmitted and received by the boundary device to maintain the link therethrough. Address information of a keep-alive purports that keep-alive has traversed or is to traverse a predetermined portion of the communication link, such as a wireless 'over the air' portion. However, the keep-alive is inhibited from traversing the predetermined portion. This may be accomplished by one or more of: spoofing the origin of the keep-alive such that it only appears to have traversed the predetermined portion; and causing the keep-alive to be discarded before traversal of the predetermined portion. Discard may be facilitated by configuration of the TTL field of the keep-alive or by use of a filtering device.